Combustion-testing apparatus



Jan. 25, 1927.

R. P. BROWN COMBUSTION TESTING APPARATUS Filed August 31 `Immun" INVENTOR all ATTORNEY Patented Jan. 25, 1927.

UNITED STATES PATENT OFFICE.

RICHARD P. BROWN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO BROWN IN- STRUMENT COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

COMBUSTION-TESTING APPARATUS.

Application led August 3l, 1923.

In determining combustion conditions it is frequently desirable to determine both the tem erature and the chemical analysis of the urnace heating gases at some point in the furnace or in the stack connection thereto; and the general object of the present invention is to combine a thermometric device, which ordinarily is a thermo-couple, with provisions for withdrawing furnace gases for analysis, in a simple, compact. durable and effective instrument adapted to be mounted in the wall of, and to extend into a furnace chamber, smoke'stack, stack flue or the like, to measure the temperature of the furnace gases, and to withdraw a sample portion of such gases for analysis.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification; for a better understanding of this invention however, its advantages and specific objects attained with its use, reference should be had to the accompanying drawings and descriptive matter in which I have illustrated a preferred embodiment of my invention.

The one figure of the drawing is a sectional elevation of my novel instrument and a portion of the furnace or flue in which it is installed.

In the form and use of my invention illustrated in the drawing, A represents the wall of a boiler housing. stack, stack flue, or the like provided with an opening A through which my novel instrument 1s inserted so that the thermo-couple junction C of the instrument will be exposed to the temperature of the furnace gases at the inner side of the wall A, and a sample portion of the Hue gas may be withdrawn for analysis through the annular space e between the protective tube D of the thermocouple device proper, and the surrounding tubular casing member E. The tubular parts D and E are rigidly connected at their outer ends by means including a` part F, shown as a pipe fitting having an opening F at its inner side into which the outer end 0f the pipe D is threaded, and an opening F2 at its outer side into which is secured the terminal box G of the thermo-couple. As shown the box G is provided with a nipple Gr which is externally threaded and is screwed into a suitable bushing H. The

Serial No. 660,839.

latter is externally threaded and is screwed into the opening F2. The nipple G is internally threaded, and has screwed into it the threaded outer end of the tube D whereby the tube D is rigidly held in the proper co-axial relation with the tube E. The fitting part F is also provided with a lateral outlet F3 into which is screwed the end of the pipe I through which the gases withdrawn through the channel C and fitting part F are passed to the gas analyzing apparatus proper. Advantageously the 'member F is formed with a lateral opening F, located at the opposite side of the fitting from the opening ld 3, and normally closed by a plug J which may be removed when necessary to facilitate the removal of soot or other furnace dust accummulating in the device. Advantageously a flange member K is threaded onto the outer end of the tube E to bear against the outer face of the furnace wall at the margin of the opening A. The thermo-couple conductors c extend from the thermo-couple junction C through the tube D into the junction box G in which the are secured to binding posts G', throug which they may be connected to a milli-volt meter or other suitable electrical measuring instrument.

My improved testing instrument is obviously simple, compact, and durable, and is well adapted for its intended use. The tube D which forms the outer Wall of the annular -gas channel C through which the gas for analysis is withdrawn, may readily be made of a material and weight to insure it against injury by Contact with the furnace wall when the instrument is being inserted and removed in a furnace Wall opening, and to avoid deterioration from the temperature and chemical action of the furnace gases to which its inner end is exposed. The outer tube D, in addition to forming the outer wall of the annular gas channel e, forms a protective shield about the less robust thermo-couple tube, which substantially eliminates possibility of injury to the latter by contact with the wall of the opening A in inserting or removing the instrument. The tubes B and E may be made of any suitable dimensions. To measure the temperature and sample the flue gases in the last pass of a boiler, or in the stack, or stack flue of a-boiler furnace, the tube E should ordinarily extend into the as space vsix inches or so from the inner sie of the wall A, and the thermo-couple junction C should be located six.inches or so. beyond the inner end of the tube E to prevent the junction C from being cooled by radiation to the pipe E, or from being lagged by the latter.

With the type of construction illustrated, a device to suit any particular condition oi' use, such as furnace Wall thickness the points in the furnace chamber from which the gas for analysis is Withdrawn and the gas tem-' perature taken, and the general tem erature range to be measured, may be quic ily and readily assembled from standard parts which may be kept in stock. The construction also permits of the ready replacement of injured or unsuitable parts.

The fact that with my instrument, the furnace gas temperature is read and the furnace gas sample is Withdrawn` from points in close proxlmity to, and definitely positioned with respect to one another adds to the informative value of the observations in many cases.

While in accordance with the rovisions of the statutes I have illustrate and described the best embodiment of my invention now known to me it Will be apparent to those skilled in the art that formal changes may be made in the apparatus disclosed without departing from the spirit of my invention as -'set forth in the appended claims.

Having now described my invention, what I claim as new, and desire to obtain by Letters Patent, is:

1. An instrument comprising an elongated body adpted to be inserted into a gas space through -an opening in the wall thereof and formed With a longitudinal channel receiving gas from said space adjacent the inner end of said body and having an outlet adjacent the outer end of said body through which' gas may be withdrawn for analysis, and thermometric means mounted in said body and includingttemperature responsivev means adjacent the inner end of theY latter `for measuring the--..tmperature of said gas space. y

2. An instrument comprising a thermocouple with its protecting casing, and a member surroundingksaid casing for a portion of its length and formed with a as channel, having an inlet adjacent the ot junction ofsaid couple.

3. An instrument com rising in combinationba-thermo-couple wit its protective casing and a tubular clement secured to and surrounding said casing and having an open, end from which the hot junction end of the thermo-couple projects for a short distance, said tubular element being separated from said casing to provide a gas channel extending longitudinally, of the casing, and means `providing an outlet from said channel for gas entering the latter4 at said open end 'of said member.

4. An instrument adapted to be placed iu an opening in the Wall of a gas space, and comprising a thermo-couple at its inner end, and a protective casing therefor, a chambered fitting part attached to the outer end of said casing, a tubular member attached to said fitting part and surrounding said casing for a portion of its length and separated therefrom by an annular gas channel open to said space at its inner and opening into said chamber-ed part at its outer end, and a lgas take off conduit secured 4to said fitting part.

Signed at Philadelpjhia in the county of Philadelphia and State of Pennsylvania this twenty-eighth day of August A. D. 1923.

RICHARD P. BROWN. 

